

#include <iostream>
#include <string>
#include <fstream>

class util
{
public:
    static bool ReadFileContent(const std::string &filename, std::string *out)
    {
        //以字符串方式读文件
        //out->clear();
        // std::ifstream in(filename);
        // if (!in.is_open())
        //     return false;
        // std::string line;
        // while (std::getline(in, line))
        // {
        //     *out += line;
        // }
        // in.close();
        // return true;
        //以二进制流形式读取
        int filesize=Filesize(filename);
        if(filesize>0)
        {
            std::ifstream in(filename);
            if(!in.is_open())
            return false;
            out->resize(filesize);
            in.read((char*)out->c_str(),filesize);
            in.close();
        }
        else
        {
            return false;
        }
        return true;
    }
    static bool ReadOneLine(std::string &bigstr, std::string *out, const std::string &sep /*\r\n*/)
    {
        auto pos = bigstr.find(sep);
        if (pos == std::string::npos)
            return false;

        *out = bigstr.substr(0, pos);
        bigstr.erase(0, pos + sep.size());
        return true;
    }
    //获取问价大小
    static int Filesize(const std::string& filename)
    {
        //以字节流形式打开
        std::ifstream in(filename,std::ios::binary);
        if(!in.is_open())
        return -1;

        in.seekg(0,in.end);
        int filesize=in.tellg();
        in.seekg(0,in.beg);
        return filesize;
    }
};